evatt



(No Model.) 2 Sheets-Sheet 1. G. L. EVATT.

RATGHET DRILL. No. 462,543. Patented Nov. 3, 1891.

ATTORNEYS (No Model.) 2 Sheets-Sheet 2.

. EVATT.

HET DRILL.

No. 462,543. Patented Nov. 3, 1891.

A TTOBNE Y S 'llnrrnn stares PATENT FFICE.

(llCOl-l lE ll. EYATT, OF PORT HOPE, ANAl lA.

RATCHET-DRILL.

SPECIFICATION forming part of Letters Patent No. 462,543, dated November3, 1891.

Application tiled October 15, 1890. Serial No. 368,180. (No model.)

To (0% whom it may OOH/06772,.

Be it known that I, GEORGE ll. EVATT, of Fort llope, Province ofOntario, Dominion of Canada, have invented a new and ImprovedRatchet-Drill, of whichthe following is a full, clear, and exactdescription.

The object of the invention is to provide a new and improvedratchet-drill which is simple and durable in construction, veryeffective in operation, and adapted to drive the bit continuouslyforward on both the forward and backward strokes of the handle.

The invention consists in certain parts and details and combinations ofthe samegas will be described hereinafter and then pointed out in theclaims.

Reference is to be had to theaccompanying drawings, forming a part ofthis specification,

in which similar letters of reference indicate corresponding parts inall the figures.

Figure 1 is aside elevation of the improvement. Fig. 2 is a sectionalside elevation of the same. Fig. 3 is a sectional plan view of part ofthe improvement on the line :1; .r of Fig. 1. Fig. l is a sectional planview of the improvement on the line 9 1 of Fig. Fig. 5 is an invertedplan view ofone of the ratchet mechanisms. Fig. 6 is an enlargedsectional plan view of the improvement on the line .2' of Fig. Fig. 7 isan enlarged side elevation of the stock. Fig. 5 is an enlarged sec--tional' plan view of part of the improvement on the line U. u'of Fig. l,and Fig. 9 is a similar view of part of the improvement on the line u rof Fig. 2.

The improved ratchct'drill is provided with a stock A, in thelowerend ofwhich is adapted to be held the bit B. The stock A is provided with ashank C, mounted to turn in a hub D, formed centrally in the bottom ofthe casing D, in or through which the said shank C tends centrally. ()nthe lower end of the shank C formed a collar (f', abutting against theunder side of the hub I), and on the said shank are also formed the tworatchet-wheels C and C Fig. 7, and a reduced end O provided with anannular groove and extending through the cover F, held on top of thecasing D. The latter is provided on its outside with ahorizontally-extending handle E, taken hold of by the operator to workthe ratchet drill, as hereinafter more fully de- On the hub F is mountedto turn loosely the horizontally-extending handle I, carrying thespring-pressed pawl I, engaging a ratchetwheel J, secured or formed onvthe hub F, and serving to turn the said huh and its cover F, so as toscrew up the feed-screw II when feeding the device.

The lower ratchet--wheel C of the shank C is engaged by, a pawl 1, Fig.8, pressed on by a spring E and pivoted in the handle E of the casing D.The next ratchet-wheel C of the shank G is engaged by one, two, ormorespring-pressed pawls K, pivoted in the lower face of a gear-wheel K,mounted to turn loosely on the shank G. The gear-wheel K is in mesh witha number of pinions L. Fig. i journaled in an annular flange F Fig. (i,projecting from the bottom of the cover F into the casing D. Each of thepinions L carries a larger gear-wheel X in mesh with an internalgear-wheel 0, formed on the inside of the casing D.

In order to lock the cover F, the casing D, and the stock A together,blocks P are employed, which pass through recesses in the hub F into theannular groove 0", formed in the upper reduced part C" of the shank O ofthe stock A. Each of the blocks P is provided with anoutwardly-projecting pin P, engaged by an L-shaped slot Q, formed on aring Q, adapted to slip over the hub F of the cover to prevent the saidblocks from becoming disengaged from the hub F.

The operation is as follows: \Vhen the several parts are in position, asillustrated in Figs. 1 and 2, the operator takes hold of the handleIwith his left hand and with his right hand moves the handle E backwardand forward. At the forward movement of the handle E in the direction ofthe arrow a, (see Fig. (3,) the spring-pressed pawl E ing a tooth of theratchet-wheel C turns the stock A and the bit 13 in the direction of thearrow a. 0n the backward movement of the ICO ,by engagengaging thegear-wh eel K, turns the latter in the direction of the arrow at. Thismovement of the gear-wheel K causes a like movement of the stock A asthe pawls K of the said gear-wheel engage the ratchehwheel C of thestock A and its bit B. Thus on the forward as well as on the backwardstroke of the handle E a forward movement is imparted to the bit B, itbeing understood that v on the forward movement of said handle thegear-wheels N and L roll off on their respective gear-wheels O and K,the pawls K sliding back on the ratchet C Itis not necessary to holdeither handle stationary at any time. The only care required is that thehandle I must be moved from the operator while E is being drawn towardhim. The working of the drill is not interfered with at any time, butcontinues uninterruptedly until the desired work is accomplished.

Having thus described my invention, I claim as new and desire to secureby Letters Patent- 1. In a ratchet-drill, the combination, with a stockadapted to carry the bit and provided with two ratchet-wheels, of ahandled casing in which is pivoted to turn the said stock and which isconnected by a spring-pressed pawl with one of said ratchet-wheels, anda gearwheel carrying spring-pressed pawls engaging the said secondratchet-wheel, the said gearwheel being connected by differentialgearwheels with the handled casing, substantially as shown anddescribed.

2. In a ratchet-drill, the combination, with a stock adapted to carrythe bit and provided with two ratchet-wheels, of a handled casingprovided with an internal annular gear-wheel, a gear-wheel mounted toturn loosely on the said stock within the said casing, springpressedpawls held in the said gear-wheel and adapted to engage one of saidratchet-wheels on the stock, and differential gear-wheels connecting thesaid gear-wheelwith the internal annular gear-wheelon the said casing,substantially as shown and described. 3. In a ratchet-drill, thecombination, with a stock adapted to carry the bit and provided with tworatchet-wheels, of a handled casing provided with an internal annulargear-wheel, a gear-wheel mounted to turn loosely on the said stockwithin the said casing, springpressed pawls held in the said gear-wheeland adapted to engage one of said ratchet-wheels on the stock,differential gear-wheels connecting the said gear-wheel with theinternal annular gear-Wheel on the said casing, and a spring-pressedpawl held on the said handled casingand engaging with the other of thesaid ratchet-wheels on the stock, substantially as shown and described.

, 4:. In a ratchet-drill, the combination, with a stock adapted to carrythe bit and provided with two ratchet-wheels, of a handled casingprovided with an internal annular gear-wheel, and a pawl engaging one ofsaid ratchetwheels, a cover adapted to be held in a fixed position ontop of the said casing, differential gear-wheels mounted to turn in thesaid cover, and a central gear-wheel mounted to turn loosely on the saidstock and in mesh with the said differential gear-wheels, and alsoprovided with spring-pressed pawls engaging with the other ratchet-wheelon the stock, substantially as shown and described.

5. In a ratchet-drill, the combination, with a stock adapted to carrythe bit and provided with two ratchet-wheels, of a handled casingprovided with an internal annular gear-wheel, and a pawl engaging one ofsaid ratchetwheels, a cover adapted to be held in a fixed position ontop of the said casing, differential gear-wheels mounted to turn in thesaid cover, a central gear-wheel mounted to turn loosely on the saidstock and in mesh with the said differential gear-wheels and alsoprovided with spring-pressed pawls engaging with the other ratchet-wheelon the stock, a feed-screw screwing in the said cover, and means,substantially as described, for turning the said cover, as set forth.

6. In a ratchet-drill, the combination, with a stock adapted to carrythe bit and provided with two ratchet-wheels, of a handled casingprovided with an internal annular gear-wheel, and a pawl engaging one ofsaid ratchetwheels, a cover adapted to be held in a fixed position ontop of the said casing, differential gear-wheels mounted to turn in thesaid cover, a central gear-wheel mounted to turn loosely on the saidstock and in mesh with the said differential gear-wheels, and alsoprovided with spring-pressed pawls engaging with the other ratchet-wheelon the stock, and means, substantially as described, for locking thesaid cover to the said stock and the said casing, substantially as shownand described.

7. The combination, with the handle-casing, the rotary stock mountedtherein, extending at its upper end through the top of the casing andprovided with an annular groove C of the central hub F, into thelowerend of which the said grooved end of the socket projects, the blocks P,extending through recesses in the hub into the said groove C andprovided on their outer ends with the pins P, the ringQ on the hub,provided with angle slots, into which said pins project, the feed-screwextending through the upper threaded end of the hub, the ratchetwheel onthe hub, and a handle I, having a pawl engaging the said ratchet,substantially asset forth.

GEORGE L. EVATT.

Witnesses:

PHILIP H. HARRAW, RICHARD H. TAYLOR.

ITO

IIS

